Group 4 and 5 - 'i_e, y, igh, i, ie'

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Across
  1. 3. To separate into parts
  2. 5. A plan or pattern for making something
  3. 7. To make someone scared
  4. 8. A shape with three sides
  5. 10. Words that end with the same sound
  6. 11. The time between sunset and darkness
  7. 15. A vehicle with two wheels powered by pedals
  8. 16. Moved the body to stay fit
  9. 18. The study of the natural world
  10. 19. To go up something, like a ladder or hill
Down
  1. 1. Help or advice given to someone
  2. 2. Staying alive in hard conditions
  3. 3. A slanted line between two corners
  4. 4. Easily excited or thrilled
  5. 6. Complete absence of sound
  6. 9. Able to be reused or processed again
  7. 12. A flash of electricity during a storm
  8. 13. Clean and healthy
  9. 14. Wearing something to hide identity
  10. 17. Very pleasing or enjoyable